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The Grob G-520 Strato (Egret), was originally intended as a cheap alternative to the U-2. Of the six built, one flies for Australia, while four remain in service in the US, utilized by agencies like the CIA and DEA as platforms for ELINT and high-altitude radio relay, as well as atmospheric sciences.

The Grob G-520 Strato (Egret), was originally intended as a cheap alternative to the U-2. Of the six built, one flies for Australia, while four remain in service in the US, utilized by agencies like the CIA and DEA as platforms for ELINT and high-altitude radio relay, as well as atmospheric sciences.

I don't think it is a YO-3A, but rather the earlier verison QT-2 shown in the upper left corner of the first photo panel on this page.http://www.yo-3a.com/history.html
Note the way the vertical stabilizer is forward of the horizonal stabilizer; the shape of the wing, and the single seat cockpit. It's just the propeller that is either missing or too small to see.

i worked on the egret program for approx. 3.5 yrs and while some of your info is correct, there is a lot more to the aircraft and the program available to the public. one interesting item; it broke the record for time to climb, max alt obtained and max alt. sustained for a manned turbo-prop aircraft.